Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fb89245f318f5d…

MALICIOUS

PDF

136.9 KB Created: 2021-09-16 05:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ed0e297ce155b3c1a3e6f6e6da2442f SHA-1: 4e36f0a00ce0b8d9a785d465b96b8cf3ad3eca6a SHA-256: 24fb89245f318f5d06b2f3b1853927b5af0e11d2dc7456471dc8cff891bd0ae2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple PDF files hosted on various domains, some of which are associated with compromised CMS uploads. The presence of a 'link farm' heuristic and numerous embedded URLs suggests an attempt to distribute malicious content or conduct phishing by directing users to external sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://atlaskvartir.ua/data/uploads/files/lewesegazuwovonuxurokofu.pdf In PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/63807276292.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/g6hm0pm8deb6eq3e0a8barog07/telitakizoda.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130c4104a4a9---78600624400.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/lorivofoderuwoxetatimerab.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/lojisevuwem.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/norimiritizuzirig.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/90986685838.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc039b43c9---getisetero.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161409ff8111c9---34726715527.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/34364419628.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/57464780488.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/84427343084.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/sakunepijisek.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/pasulelalili.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/ponatukuzi.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/xinudupexose.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/3390833508.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/pitosifotewexa.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/vajofawazoxut.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/12640478508.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/52650325363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=games+like+fall+guys+free+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C98F 10804 bytes
SHA-256: f9d58a7e46da03a0f485261023dd81c7ca0e323e7fa7cf1ab96df55609445d24
font_02_sfnt_off0001e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E275 19612 bytes
SHA-256: 239264a4830359b7234dd3f5b2572c63091e054a00350914a64a4936cdca6a48

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